<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>进阶金蒜器</title>
</head>
<body>
<div>
  <input type="text" v-model="n1">
  <input type="text" v-model="n2">
  <input type="button" value="加" @click="f('+')">
  <input type="button" value="减" @click="f('-')">
  <input type="button" value="乘" @click="f('*')">
  <input type="button" value="除" @click="f('/')">
  <h3>结果：{{result}}</h3>
</div>
<script src="JS/vue.min.js"></script>
<script>
  let v = new Vue({
    el: "body>div",
    data: {
      result: "0",
      n1: "", n2: ""
    },
    methods: {
      f(x) {
        if (isNaN(v.n1) || isNaN(v.n2)) {
          v.result = "输入错误！";
          return;
        }
        /* eval() 此方法可以让字符串以JS代码执行 */
        v.result = eval(v.n1+x+v.n2);
      }
    }
  })
</script>
</body>
</html>